Hoisting mechanism



, March 15, 1932. ZETTERLUND 1,849,213

HOISTING MECHANISM Original Filed Nov. 26, 1926 4 Sheets-Sheet 2 51 cf/v/z/e/wfaw 7775175472 Zit /X12270 GDqw/ T. ZETTERLUND Marsh 15, 1932.,

noxswme MECHANISM Original Filed Nov. 26, 1926 '4 Sheets-Sheet "3 j/V/Z/ 0/ March 15, 1932. T. ZETTERLUND 1,849,213

HOI STING MECHANISM Original Filed Nov. 26, 1926 4 Sheets-Sheet 4 a I QJ/V/u 07/02/ 777500277" ZEZiET/UHQ" Patented Mar. 1 5,

'matima mas am or vritwnuknn, Wisconsin, h ssienortfroixnnnnrt {Al}; 7 J

' MA'rIc HoIs'r co, or MILWAUKEE, WISCONSIN .2

Hors'rINs MEonANIsM Substitute for-application Serial 1%. 150,718, med m mbemaiza- This application filed January 19,;

193 1. s m nmsos sa c This inventionrelatestoja hoisting mechanism, and is a Substitute for applicatiOIl. Se: rial No.l50,7l6,liled l lov. 26,1926;

Objects of thisiinventioniare toorov1de a ve form of hoisting mechanism,such for example, as thatemployed in operating temporary elevators used in construction work,

which is so constructed 'thatva worm;- and fworm wheel are interposed in thedriving gear train for the hoisting mechanism with theworman'd worm wheel having a locking relation, so that theworm can not be driven backwards by the loadimposed on the ho1string mechanism, and 'to' provide means for V selectively coupling either of two reversely retating members to. the, worm," such control mechanism permitting-the coupling of only one of such members'at a time. a V ,Further objects are to provide a, hoisting mechanism in which a lockingrworm' and worm wheel are employed, and in which quiclc'motion mechanism is provided for positively locking either of two reversely rotat ing members to the worm shaft, so that there is m slipping engagement as thevmemb-ers lock the rotatingmembers operative connection with the shaft-,but inwhich such locking is quickly and positively secured;

Further objects are to provide a compact,

serviceable and novel type of hoisting mechanism in which the entire apparatus is portais and self-contained, and in which the worm is rotated in eitherfl direction by-means of loosely mounted clutch controlled pinions which mesh with a main driving gear, such gear being in turn driven by a pinion.

An embodiment of the invention 1s shown in the accompanying drawings in which Figure 1 is a side elevation'of the appara tusj FigureQ is a sectional view on the line .2.-2 of Figurel;

' Figure 3 is a sectionalview on the 'of Figure 1;

Figure 4 is an end view of the apparatus with one of the end caps of the main casing removed;

Figure '5 is a fragmentary View to an enlarged scale similar to Figure 1, taken from the 3+3 I the bh osite side with the hoisting .driim moved; r V is fiReferring t that the apparatus comprises azbase or frame rality of small rollers 3 so that it may be easily drawn orpushed into position and may be. as readily transported. I

- The motor is providediwitha driving shaft o the drawings, it will be seen which is coupled 'by, means of the universal may be seen from Figure 2, "carries a'bevel pinion 7 which'meshes with abevel gear 8. This bevel gear is provided with a double joint '5 to an aligned shaft 6. fTlllS shaftfi, as 7V face,as maybe seen from Figure 2, and its inner face meshes with apair of bevelled-pin ions 9-, and, consequently, 1 reversely rotates such pinions. mounted'upon a worm shaft 10, such shaftbe ingrigidly keyed'to a worm 11. Suitablball These pinions are loosely bearingsare provided, as showninFi'gureQ,

to reduce thecfriction of the parts. :5

It is to befnotedfrom Figure 2 that each' iof F the bevelled pinions,9 isprovided with "a clutch having dog teeth 12 andthat a pair of 'slidable clutch members 12 are loosely splined to the shaft 10. These clutch mem bers12a lsohave dog teethgl3xwhich are '3; i 7, adapted to positively interlock with the'teeth 12-when the clutches are closediuq-These clutches are controlled "by, the.'forked levers 15L which, as maybe? seen fromFigurecfi, are 7 F I carried by shafts 15.;1These fshaftsi15 project outwardly from the 1 main easing. 16,

lubricant. The shafts'15'c'arry inwardly proj ecting levers .16f which are provided "at their free endswith 'rollers or cam" followers 17;

These ca'm followers are adapted to ride'upon' a cam disc 18. It is to be noted that the disc whichhouses the worm,.-the'pinio1is,-and the 1 bevel gear and clutchparts, as previously 'described,"arid consequentlywhich may carry J a lubricant and-be sealediagainst lossof such is to be noted that the levers 16 are each provided with projecting lugs 21 which are normally locked to hold the levers 16 against upward motion by means of lugs 22 carried by latching levers 23. 7 These latching levers 23 are provided with stops 24: andare held in latching position under normal conditions by means of the spring 25, which, as may be seen from Figure 5, extends from one of the levers 23 to the other.

The cam disc 18 is integrally formed with a project-ing ear or lug 26 which constitutes a trip and is adapted to strike the projections 22 and to thus unlock the corresponding latch 23 and permitthe appropriate levers 16 to snap inwardly with a quick motion, as the notch 19 is then positioned opposite the corresponding roller 17. This causes the corresponding clutch to quickly close and to positively lockits pinion to the wormshaft.

There is no friction slip in this mechanism, but instead the pinions are quickly and positively locked alternately to the shaft in accordance with the rotation of the controlling cam disc 18. This cam disc 18 is mounted concentrically with the hoisting shaft 27 and is provided with a controlling lever 28 integral therewith and apertured, as shown in Figure. 5, for the reception of acontrol link or control cables. Obviously, the control cables may extend along the elevator shaft and may be connected to limit mechanism actuated by the elevators.

The shaft 27 carries a worm wheel 20 (see Figure 3) which has an interlocking engagement with the worm 11, so that when the worm ceases to rotate the shaft 27 is locked against motion.

The shaft 27 carries at its outer end a hoisting drum 30. which receives the hoisting cables in the usual mannerx.

In order to hold the cam disc 18 in neutral position against inadvertent rocking motion, a roller 31 (see Figure is provided. This roller normally seats within the notch 19 and thus holds the cam disc aginst rotary motion. The roller is carried by a spring pressed plunger 34' (see Figure which is guided in the'main casing of the machine.

It willbe seen, therefore, that a very simple and serviceable type of hoisting mechanism has been provided by this invention, which permits. the selective engagement of the worm the invention may be variously embodied and as the scope of such invention is to be determined as claimed.

I claim:

1. In a hoisting mechanism, the combination of a driven shaft, a worm wheel mounted upon said shaft, a Worm having a locking engagement with said worm wheel and having an extended shaft, a pair of pinions carried by the worm shaft and loosely mounted thereon, clutches for positively locking said pinions to said shaft, a bevel gear for rotating said pinions in opposite direction, a pair of levers for operating said clutches, springs urging said levers into clutch closing position, a cam disc cooperating with the free end of said levers and having a notch permittng one or the other of said levers to move inwardly to clutch closing position, a latch associated with each ofsaid levers and restraining its inward motion, and a trip for tripping said latch and permitting the quick inward motion of the corresponding lever.

'2. In a hoisting mechanism, the combination of a driven shaft, a worm carried by said shaft, a worm wheel having a locking engagement with said worm and having an extended shaft, a pair of pinions carried by said worm shaft, a bevel gear meshing with said pinions and rotating such pinions in opposite directions, said bevel gear having a second bevel gear face, a driving pinion meshing with the teeth on the second face of said bevel gear, and interlocking means for closing one or the other of said clutches, and means for selectively locking said pinions to said shaft. I

In testimony that I claim the foregoing I have hereunto set my hand at Milwaukee, in the county of Milwaukee and State of Wisconsin. V

v THEODOR ZETTERLUND.

shaft witheitherof the two reversely rotating pinions. Further, it will be seen that the reversely rotating pinions are driven in a simplemanner by a bevel gear, and that this bevelgear. in turn is driven by a pinion operatively connected to the motor shaft.

It will be seen further that the entire apparatus is of rugged and substantial construction and is foolproof.

Although the invention has been described in considerable detail, such description is intended as illustrative rather than limiting as 

